patman: Make sure sendemail.suppresscc is (un)set correctly

Setting sendemail.suppresscc to all or cccmd leads to --cc-cmd
parameter being ignored, and emails going either nowhere, or
just to the To: line maintainer.

Signed-off-by: Nicolas Boichat <drinkcat@chromium.org>
Reviewed-by: Simon Glass <sjg@chromium.org>
diff --git a/tools/patman/control.py b/tools/patman/control.py
index e67867b..8f4afea 100644
--- a/tools/patman/control.py
+++ b/tools/patman/control.py
@@ -166,6 +166,8 @@
     ok = check_patches(series, patch_files, args.check_patch,
                        args.verbose)
 
+    ok = ok and gitutil.CheckSuppressCCConfig()
+
     its_a_go = ok or args.ignore_errors
     if its_a_go:
         email_patches(